Question

Which line has an x-intercept of 4?


4x + y = 8
-4x + y = 8
2x+ 2y = -8
-2x + 2y = -8

Answer 1

What is an x-intercept? That's where the line hits the x-axis. Since it's hitting the x-axis itself, which is just a giant number line, that means we don't know what x is. But do we know what y is when we hit the x-axis with our line? Yes. Draw a picture and see if you can figure out what y should equal so that you can plug that value in and solve for x in the equation.

Answer 2

When I say draw a picture, I just mean this:

So what's the value of y when the line hits the x-axis?

Answer 3

so what is it?

Answer 4

Have you considered one of these?

Solve for y to put them in Slope-Intercept Form and then read the y-intercept?
Divide by 8 or -8 as given to put them into Intercept Form and read the y-intercept?

Do it! You won't.